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Strange MMC boot behavior

Question asked by ROBERT WOOD on Jun 22, 2016
Latest reply on Jun 28, 2016 by Yuri Muhin
  1. On our iMX6DL board we have a Micron MTFC4GACAJCN-4M IT, eMMC device on uSDHC3, which is DDR and byte capable. When configuring for boot, we find the processor boots when the CONFIG2(7:5) field is set to "111" or "010" but not to "110".  Now the reference manual states in Table 5-6


Bus Width:


000 - 1-bit


001 - 4-bit


010 - 8-bit


101 - 4-bit


DDR (MMC 4.4)


110 - 8-bit DDR (MMC 4.4)


Else - Reserved

What are we doing wrong or right